Question

# You just landed a job with Super Droid Robots, Inc., and you've been assigned to test the newly designed rescue robot for the Navy. The robot is tested on a

raft floating in a pool, and you're making measurements from the edge of the pool. The raft is 15.0 m long, and has a mass of 193 kg.The robot's mass is 105 kg, and travels with a speed of 3.50 m/s.RAN a) The raft is initially tied to the front of the pool by a 3.00 m long cable. If the robot starts from the left end of the raft, what is the kinetic energy of the system consisting of the robot and the raft after the robot has traveled 12.0 m along the raft? b) The experiment is repeated with the cable detached, but the right end of the raft again starting3.00 m from the right end of the pool. Now what is the kinetic energy of the system after the robot has traveled 12.0 m along the raft? c) Is your answer to Parts a and b the same? If not, why not? Quantitatively account for the difference. (Hint: Why is it wrong to say that in Part a, since the raft isn't moving, the cable is doing no work on the system?) ) In Part b, after the robot traveled 12.0 m along the raft, how far away was the raft from the right end of the pool? e) The robot has to be able to throw a 30.0 kg mass a distance of 14.0 m. The raft is again initially 3.0 m from the right end of the pool with the cable detached, and the robot at the left edge of the raft. If the robot tosses a 30.0 kg mass to the right, where will it land relative to the right edge of the raft? (Ignore the length of the robot.) f) Where will the 30.0 kg mass land relative to the right end of the pool?

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